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Hello @Baqari,
I wanted to add to this post, that starting with AutoCAD 2016 based products, the ability to add passwords to drawing files was removed. It is a recommendation that you purchase an encryption product that meets current industry standards to better protect your files.
Please review the "Can a drawing file be password protected in AutoCAD?".
Please "Accept Solution" if a reply or replies have helped resolve the issue or answered your question, to help others in the community.

Natasha
Community Product Support Specialist
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